Audaspace: Moving audaspace 1.3 into extern.

Deleting the old internal audaspace.

Major changes from there are:
- The whole library was refactored to use C++11.
- Many stability and performance improvements.
- Major Python API refactor:
 - Most requested: Play self generated sounds using numpy arrays.
 - For games: Sound list, random sounds and dynamic music.
 - Writing sounds to files.
 - Sequencing API.
 - Opening sound devices, eg. Jack.
- Ability to choose different OpenAL devices in the user settings.

extern/audaspace/src/sequence/SequenceReader.cpp

@@ -0,0 +1,198 @@
+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#include "sequence/SequenceReader.h"
+#include "sequence/SequenceData.h"
+#include "Exception.h"
+#include "SequenceHandle.h"
+
+#include <algorithm>
+#include <mutex>
+#include <cmath>
+
+AUD_NAMESPACE_BEGIN
+
+SequenceReader::SequenceReader(std::shared_ptr<SequenceData> sequence, bool quality) :
+	m_position(0), m_device(sequence->m_specs), m_sequence(sequence), m_status(0), m_entry_status(0)
+{
+	m_device.setQuality(quality);
+}
+
+SequenceReader::~SequenceReader()
+{
+}
+
+bool SequenceReader::isSeekable() const
+{
+	return true;
+}
+
+void SequenceReader::seek(int position)
+{
+	if(position < 0)
+		return;
+
+	m_position = position;
+
+	for(auto& handle : m_handles)
+	{
+		handle->seek(position / m_sequence->m_specs.rate);
+	}
+}
+
+int SequenceReader::getLength() const
+{
+	return -1;
+}
+
+int SequenceReader::getPosition() const
+{
+	return m_position;
+}
+
+Specs SequenceReader::getSpecs() const
+{
+	return m_sequence->m_specs;
+}
+
+void SequenceReader::read(int& length, bool& eos, sample_t* buffer)
+{
+	std::lock_guard<ILockable> lock(*m_sequence);
+
+	if(m_sequence->m_status != m_status)
+	{
+		m_device.changeSpecs(m_sequence->m_specs);
+		m_device.setSpeedOfSound(m_sequence->m_speed_of_sound);
+		m_device.setDistanceModel(m_sequence->m_distance_model);
+		m_device.setDopplerFactor(m_sequence->m_doppler_factor);
+
+		m_status = m_sequence->m_status;
+	}
+
+	if(m_sequence->m_entry_status != m_entry_status)
+	{
+		std::list<std::shared_ptr<SequenceHandle> > handles;
+
+		auto hit = m_handles.begin();
+		auto eit = m_sequence->m_entries.begin();
+
+		int result;
+		std::shared_ptr<SequenceHandle> handle;
+
+		while(hit != m_handles.end() && eit != m_sequence->m_entries.end())
+		{
+			handle = *hit;
+			std::shared_ptr<SequenceEntry> entry = *eit;
+
+			result = handle->compare(entry);
+
+			if(result < 0)
+			{
+				try
+				{
+					handle = std::shared_ptr<SequenceHandle>(new SequenceHandle(entry, m_device));
+					handles.push_back(handle);
+				}
+				catch(Exception&)
+				{
+				}
+				eit++;
+			}
+			else if(result == 0)
+			{
+				handles.push_back(handle);
+				hit++;
+				eit++;
+			}
+			else
+			{
+				handle->stop();
+				hit++;
+			}
+		}
+
+		while(hit != m_handles.end())
+		{
+			(*hit)->stop();
+			hit++;
+		}
+
+		while(eit != m_sequence->m_entries.end())
+		{
+			try
+			{
+				handle = std::shared_ptr<SequenceHandle>(new SequenceHandle(*eit, m_device));
+				handles.push_back(handle);
+			}
+			catch(Exception&)
+			{
+			}
+			eit++;
+		}
+
+		m_handles = handles;
+
+		m_entry_status = m_sequence->m_entry_status;
+	}
+
+	Specs specs = m_sequence->m_specs;
+	int pos = 0;
+	float time = float(m_position) / float(specs.rate);
+	float volume, frame;
+	int len, cfra;
+	Vector3 v, v2;
+	Quaternion q;
+
+
+	while(pos < length)
+	{
+		frame = time * m_sequence->m_fps;
+		cfra = int(std::floor(frame));
+
+		len = int(std::ceil((cfra + 1) / m_sequence->m_fps * specs.rate)) - m_position;
+		len = std::min(length - pos, len);
+		len = std::max(len, 1);
+
+		for(auto& handle : m_handles)
+		{
+			handle->update(time, frame, m_sequence->m_fps);
+		}
+
+		m_sequence->m_volume.read(frame, &volume);
+		if(m_sequence->m_muted)
+			volume = 0.0f;
+		m_device.setVolume(volume);
+
+		m_sequence->m_orientation.read(frame, q.get());
+		m_device.setListenerOrientation(q);
+		m_sequence->m_location.read(frame, v.get());
+		m_device.setListenerLocation(v);
+		m_sequence->m_location.read(frame + 1, v2.get());
+		v2 -= v;
+		m_device.setListenerVelocity(v2 * m_sequence->m_fps);
+
+		m_device.read(reinterpret_cast<data_t*>(buffer + specs.channels * pos), len);
+
+		pos += len;
+		time += float(len) / float(specs.rate);
+	}
+
+	m_position += length;
+
+	eos = false;
+}
+
+AUD_NAMESPACE_END